Colloidal particles Relaxation mechanisms

Thus soluble polymer, interacting in a controlled fashion with colloidal particles, can transform both the equilibrium state and the mechanical properties of dispersions. The possibilities range from equilibrium, low viscosity fluids to nonequilibrium, pseudoplastic pastes with high yield stresses. However, substantial ga( still exist in the ability to, for example, (i) create high viscosity equilibrium fluids with prescribed relaxation spectra, (ii) impart a sol-gel transition at prescribed conditions, or (iii) connect explicitly macromdecular structure with rheological behavior. 

The magnetic susceptibility relaxation is usually more important for than for Ti. In fact, this mechanism is often dominant in determining the proton linewidth in paramagnetic proteins at high magnetic fields (3). Gillis and co-workers have recently developed a theory for the related case of proton linewidth in colloidal solutions of so-called superparamagnetic particles (54,55). 

The obvious restriction on the theory that floes are made out of only two colloidal spheres can be relaxed (Overbeek, 1952 Sheludko, 1966), but the mechanism of flocculation is still based on two-particle (floe) collision. Consequently the improved solutions (see Problems 3.4 and 3.5) are still restricted to small dilutions, but valid over longer times. Some of the issues in concentrated colloid suspensions have been considered in a Faraday Discussions of the Chemical Society (1983). 

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